Troubleshooting the Speed Controller on an Ez Go Golf Cart
By Steve Smith
The E-Z-GO golf cart has two kinds of speed controllers, the Precision Drive System, or PDS, and Drive Control System (models before 1994). Both have a maintenance switch which should be flipped when servicing or troubleshooting. If your cart is having problems running at a constant speed or is performing erratically, then you should troubleshoot the controller to find out what the problem is.
Instructions
Difficulty: Moderately Challenging
Switch cart to "Tow-maintenance" mode by flipping the switch under seat. Disconnect the black battery cable (negative) from the battery, open the cover to the speed controller and then reconnect the negative battery cable.
Inspect all wires to ensure that they are attached and well connected, there are no breaks, corrosion or interference with the wires. Take the reading of the battery voltage by connecting the positive and negative probes to the battery. Write the voltage reading down.
Test the solenoid to see if this is the problem. Place the positive probe on the solenoid post that is closest to the battery. The reading should be equal to battery's voltage. If not, there is a wiring issue in the solenoid. Connect the positive probe to the other post and take a reading. If the voltage is not at least three volts fewer than the voltage reading for the battery, the resistor must be replaced. If you have a volt reading equal to the battery volts, the solenoid is the issue.
Check the power output from the controller by connecting the negative probe to the controller's M terminal and positive to the B+ terminal. Press the accelerator and watch to see if the voltage increases. It should increase from a reading of 0 to the full voltage of the battery. If the motor is not turning, the problem may be in the directional switch or motor. The controller is bad and must be replaced if there is no voltage.
Tips & Warnings
Always use caution when handling electrical components and testing voltage readings.
About The Author
Steve Smith has published hundreds of articles on a wide range of topics, including cars, travel, lifestyle, business, golf, weddings and careers. His articles, features and news stories have appeared in newspapers, consumer magazines and on various websites, including Trails.com and eHow.com. Smith holds a Bachelor of Arts in English and journalism from University of New Hampshire Durham.
